.father, .son {
  width: 200px;
  height: 300px;
  background-color: red;
}

.son {
  color: red;
}

h1 {
  font-family: Arial, sans-serif;
  color: #333;
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 2em;
}
